Flange (tool part)

Flange (Flange), also known as flange flange or flange. The flange is a part that connects the shaft and the shaft, and is used for the connection between the pipe ends. It is also used in the equipment inlet and outlet for the connection between two devices, such as the reducer flange. The flange connection or flange joint refers to a detachable connection in which a flange, a gasket and a bolt are connected to each other as a group of combined sealing structures. Pipe flange refers to the flange used for piping in pipeline installations, and used on equipment refers to the inlet and outlet flanges of equipment. There are holes in the flange, and the bolts tightly connect the two flanges. The flanges are sealed with gaskets. Flange is divided into threaded connection (thread connection) flange, welding flange and clip flange. The flanges are used in pairs. Wire joint flanges can be used for low pressure pipelines, and welded flanges can be used for pressures above 4 kg. Add a gasket between the two flanges and tighten with bolts. Different pressure flanges have different thicknesses, and they use different bolts. When pumps and valves are connected to pipelines, the parts of these equipment and equipment are also made into corresponding flange shapes, also known as flange connections. Any connection parts that are bolted at the periphery of two planes and closed at the same time are generally referred to as "flange", such as the connection of ventilation ducts, this type of parts can be called "flange parts". However, this connection is only a part of the equipment, such as the connection between the flange and the water pump, it is difficult to call the water pump a "flange-type part". Relatively small ones, such as valves, can be called "flange parts".

Reducer flange, used to connect the motor and the reducer, and the connection between the reducer and other equipment.

Flange connection is to fix two pipes, pipe fittings or equipment respectively on a flange plate first, and add flange pads between the two flange plates, and fasten them with bolts to complete the connection. . Some pipe fittings and equipment already have flanges, which are also flange connections. Flange connection is an important connection method for pipeline construction. The flange connection is easy to use and can withstand large pressures. In industrial piping, in the home, the diameter of the pipe is small and the pressure is low, and the flange connection is not visible. If in a boiler room or production site, flanged pipes and equipment are everywhere. [1]

According to the connection method, the flange connection types can be divided into: plate type flat welding flange, neck flat welding flange, neck welding flange, socket welding flange, thread flange, flange cover, neck welding ring Loose sleeve flange, flat welding ring loose sleeve flange, ring groove surface flange and flange cover, large diameter flat flange, large diameter high neck flange, splayed blind plate, butt welding ring loose sleeve flange, etc.

As for iron plate welding flanges, many customers are asking whether the quality of iron plate welding flanges is better than forged welding flanges. In fact, the quality of iron plate welding flanges is the same as that of forged welding flanges, but where can iron plate welding flanges be guaranteed? That is, the material of iron plate welding flanges is the least guaranteed because In the general process, the density of the iron plate welding flange is no problem, but in the process of production, the blank of the iron plate welding flange is rarely tested. Therefore, after the production, the The material of the welded flange of the iron plate cannot be guaranteed

(1) Reducing flange

Product name: Reducing flange

Technical parameters: implemented in accordance with national standards

Quality Standards: Manufactured in strict accordance with relevant standards formulated by the state

Specifications: DN15-DN2000

Product packaging: wooden box or other

Product Color: Metallic

Product features: anti-corrosion, acid and alkali resistance, long service life, etc., reasonable price calculation, smooth surface, acid and alkali resistance and high temperature resistance, beautiful appearance, strong texture performance

Production process: professional overall forging, forging manufacturing, middle plate cutting, middle plate rolling, etc.

Processing methods: high-precision CNC lathe turning, ordinary lathe precision turning, argon arc welding, etc.

Nominal pressure sch5s, sch10s, sch20s, sch30s, sch40s, etc.

Manufacturing standards: national standard, American standard, Russian standard, Japanese standard, etc.

Material: 201,304.316.316L.0Cr18Ni9.321.202, etc.

Uses: Widely used in water conservancy, electric power, power stations, pipe fittings, industry, pressure vessels, etc.

Connection method: flange nut, bolt connection.

(2) Stainless steel flange

Stainless steel flange

Stainless steel flange

Product Name: Stainless steel flange

Specification: 1/2 ″ ～ 240 ″ (10-6000)

Pressure level: 0.6Mpa to 32Mpa, 150Lb to 2500Lb, PN0.25-PN42.0

Material: 304, 304L, 321, 316, 316L, 310S and other materials

Standards of the Ministry of Chemical Industry: HG5010-52 ～ HG5028-58, HGJ44-91 ～ HGJ65-91, HG20592-2009 (PN series), HG20615-2009 (Calss series)

Application: Boiler and pressure vessel, petroleum, chemical, shipbuilding, pharmaceutical, metallurgy, machinery, food and other industries.

(3) Pressure vessel flange

Product name: Pressure vessel flange

Specification: DN300 ~ 3000

Product Note: Pressure vessel flange application industry: HVAC Power Building Water Supply Pressure vessel accessories, pressure pipeline accessories.

Product category: flange series

Application industries: HVAC, building water supply, pressure vessel fittings, pressure pipe fittings.

Application technical parameters

Sealing nominal pressure PN, MPa (bar) 0.6 1.0 1.6 2.5 4.0 6.4

Concave-convex surface (MFM) DN1300 ~ 3000 DN300 ~ 3000 DN400 ~ 2000 DN300 ~ 800

Tongue and groove surface (TG) DN1300 ~ 3000 DN300 ~ 3000 DN300 ~ 3000 DN300 ~ 800

Full Plane (FF) DN300 ~ 3000 DN300 ~ 3000 DN300 ~ 3000 DN300 ~ 800

(4) Flat welding flange

The flat welding flange includes a plate type flat welding flange and a neck flat welding flange.

Plate flat welding flange (PL)

Schematic diagram of plate type flat welding flange

Schematic diagram of plate type flat welding flange

The flat welding flange is suitable for the connection of steel pipes with a nominal pressure not exceeding 2.5 MPa. The sealing surface of the flat welding flange can be made into three types: smooth, concave-convex and tongue-and-groove. The smooth flat welding flange has the largest application. It is mostly used in the case of relatively mild media conditions, such as low-pressure non-purified compressed air and low-pressure circulating water.

Sketch of neck welded flange

Sketch of neck welded flange

With neck flat welding flange (SO)

The height of the neck of the flat welded flange with neck is low, which increases the rigidity and bearing capacity of the flange. Compared with butt welding flanges, the welding workload is large, the welding rod consumption is high, can not withstand high temperature and pressure and repeated bending and temperature fluctuations, but it is more convenient to install on site, and can omit the process of welding and bruising the weld, which is more popular.

(5) Butt welding with neck (WN)

Butt Welding Flange: Neck flange welding is often referred to as a "high hub" flange. The purpose is to transfer pressure to the pipe, thereby reducing high stress concentrations in the flange base. Neck flange welding is best designed to provide welding to those flanges due to its structural value. However, the price is relatively high, because the production process of the product is complicated.

Threaded (threaded) flange: This threaded flange is connected with a threaded fastener. However, the center of the product has a thread size corresponding to the pipe. Its main advantage is that it can be assembled without welding.

Sliding flanges: Sliding flanges have lower hinges because the pipe goes into the single flange before welding. It is welded internally and externally to provide sufficient strength to prevent leakage. The sliding flanges are all boring for the larger diameter pipes. They are better than the welding of neck flanges. Due to the low initial cost, many users, but the final installation cost will probably not be low, because the added welding neck flange is less.

Lap flange: The lap flange is actually the exact same sliding flange unless it has a radius between the hole and the flange race. It is necessary to have a flange with a flange to accommodate the stub end. Often, lap stubs and lap stubs mate together to assemble the system.

The socket welding flange is a similar sliding flange unless it has a hole and counter hole size. The counter hole matches the pipe so that the pipe is inserted into a sliding flange similar to the flange. The smaller hole diameter is the same ID for the same pipe match. The limitation is the built-in hole, which stays at the bottom as a shoulder cover for the pipe. This eliminates any flow limitation when using socket welding flanges.

(6) Socket welding flange (SW)

Socket welding flange

Socket Welding Flange

Socket welding flange

Socket welding flange

Form of sealing surface: raised surface (RF), concave and convex surface (MFM), tongue and groove surface (TG), ring connection surface (RJ)

Material: Carbon Steel: ASTM A105, 20 #, Q235, 16Mn, ASTM A350 LF1, LF2 CL1 / CL2, LF3 CL1 / CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65 , F70;

Alloy Steel: ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8 / Ⅲ, 35CrMoV, 45CrMo, etc.

Manufacturing standards: ANSI B16.5, GB / T9117.1-2000—GB / T9117.4-200, etc.

(7) Threaded flange (TH)

Nominal diameter of thread flange: DN8 ～ DN100 Working pressure: 1.0 ～ 2.5 （MPa） Material of plate thread flange: stainless steel, carbon steel, alloy steel.

Thread flange use: suitable for fire protection, gas, hot and cold water, air conditioning, air pressure pipes, oil pipes, meters, hydraulic pipes and other industrial and civil pipe thread locking sealing.

Flange cover (BL)

Flange covers, also called blind flanges, are flanges with no holes in the middle for sealing pipe plugs. There are many types of sealing surfaces, including flat surfaces, convex surfaces, concave-convex surfaces, tongue and groove surfaces, and ring connecting surfaces.

Sealing surface: flat surface (FF), raised surface (RF), uneven surface (MFM), tongue and groove surface (TG), ring connection surface (RJ)

Production materials:

Carbon Steel: ASTM A105, 20 #, Q235, 16Mn, ASTM A350 LF1, LF2 CL1 / CL2, LF3 CL1 / CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70 ;

Stainless Steel: ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8;

Alloy Steel: ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8 / Ⅲ.

(8) Loose flange

Loose sleeve flange with neck butt welding ring

Loose sleeve flange butt welding ring loose sleeve with neck flange butt welding ring loose sleeve plate flange flat welding ring loose sleeve plate flange plate type over loose sleeve flange In addition to meet the need for locking after the device, there is a rod These holes can prevent the bolts from loosening when subjected to vibration. Some flange bolts without threads need to be thin, called thin rod flange bolts. Such flange bolts are conducive to the connection of variable forces. Steel There are special high-strength bolts on the structure. The head will be larger. There are also changes in size. Hot-dip galvanized round steel makes the molten metal react with the iron matrix to produce an alloy layer.

Flat welding ring loose sleeve flange (PJ / SE)

The flat welding ring loose flange is a movable flange, which is usually used on water supply and drainage accessories (the most common on expansion joints). When the factory leaves the factory, there is a flange on each end of the expansion joint, which is directly connected with the project The pipes and equipment are connected by bolts. The purpose of using a flat welding ring loose sleeve flange is generally to save material. Its structure is divided into two parts, one end of the pipe part is connected to the pipe, one end is made into a flange, and the flange part is sleeved on the flange. The flange is made of low-grade materials, and the pipe part is made of the same material as the pipe, which saves material.

Flat welding ring loose sleeve flange:

1. Save costs. When the pipe material is special and expensive, welding the flange of the same material is costly.

2. It is not easy to weld or not easy to process or requires high strength. Such as plastic pipes, glass steel pipes and the like.

3. Easy to construct. For example, it is not easy to align the flange bolt holes when connecting or prevent the flange bolt holes of the equipment from being changed in the future.

Disadvantages of flat welding ring loose sleeve flange:

1. Low pressure.

2. Low strength at the welding ring (especially when the thickness is less than 3mm)

Flat welding ring loose flange production standards:

National standard: GB / T9112-2000 (GB9113 · 1-2000 ～ GB9123? 4-2000)

American Standard: ANSI B16.5 Class150, 300, 600, 900, 1500 (WN, SO, BL, TH, LJ, SW)

Japanese standard: JIS 5K, 10K, 16K, 20K (PL, SO, BL, WN, TH, SW)

German standard: DIN2573, 2572, 2631, 2576, 2632, 2633, 2543, 2634, 2545 (PL, SO, WN, BL, TH)

Standards of the Ministry of Chemical Industry: HG5010-52 ～ HG5028-58, HGJ44-91 ～ HGJ65-91

Flange standard: HG20592-2009 (PN series) \ HG20615-2009 (Calss series)

Machinery department standards: JB81-59 ～ JB86-59, JB / T74-1994, JB / T79-94 ～ JB / T86-94

Pressure vessel standards: NB / T47020-2012 ～ NB / T47027-2012, JB1157-82 ～ JB1160-82 B16.47A / B B16.39 B16.48

Ring groove face flange and flange cover

Large diameter flat flange

Large diameter high neck flange

Character blind

Butt welding ring loose flange 6

Swivel flange

Anchor flange

Surfacing / overlaying flange

Marine welding steel flange standard number: This standard applies to marine products and marine engineering products. The main materials are: carbon steel, alloy steel, low temperature steel, stainless steel.

Forged flange connection is to connect two pipes, fittings or equipment, and forged flange connection is an important connection method for pipeline construction. The forged flange connection is easy to use and can withstand large pressures. In industrial pipelines, forged flange connections are widely used. In the home, the pipe diameter is small and the pressure is low, and the connection of the flange punching elbow is not visible. If in a boiler room or production site, flanged pipes and equipment are everywhere. Chromium content 0.1% ～ 0.5% (forged flanges generally do not contain chromium), carbon content is below 1.0% and forged flanges are manufactured by high temperature forging. Some forged flanges have surface hardness (HRC) although It can reach ≥56 (the hardened layer is only about 15）). Due to the poor hardenability of the forged flange material, its core hardness is generally only more than 30 degrees. Under normal circumstances, the water forged flange is often used.

Structure of flange sealing cover:

316 stainless steel band or non-metallic band

316 ss casting

316 ss worm gear fixture

Closed tank neoprene layer (temperature. – 34.4 ° C to 82 ° C)

ECH rubber gasket (temperature. – 34.4 ° C to 149 ° C) safety relief valve can release 5 psi

Advantages of Mestech flange seals: easy installation, no special tools required, easy detection, durable connections (not easy to damage), UV-stable non-metallic materials, reusable

Flange packing system

Suitable for temperatures of 80 ° C.

Flange packing is a unique solution to long-term corrosion problems.

Flange packing is a coating based on a composite polar polymer. The paste-like form makes it ready for use without pretreatment. The viscoelastic formulation allows this material to flow into the gaps and voids, creating a good corrosion-resistant seal.

Flange Packing System Flange packing saves time and money because of its ease of use. Provide long-term protection.

Performance: Bonded to steel, FBE (melted epoxy powder), polyurethane, polyethylene Advanced resistance weathering / salt resistance temperature range from -51 ° C to 80 ° C Fill the entire gap Removable / reusable flange surface without excessive Pretreatment uses a manual or pneumatic gun with a flexible nozzle for gentle injection. This ensures that the annular gap is completely filled before being sealed with a CZ wrapping tape.

E-2400 / E2000 high temperature flange packing-suitable for temperature of 149 ° C.

E-2400 / E2000 high temperature anti-corrosion flange packing is designed to protect the flange connection from corrosion in the high temperature of 149 ° C.

E-2400 / E2000 is a non-electrolytic method to protect steel flanges, bolts, pipes and structures with a gel.

The ASTM-B1117 salt spray test was used to test the nut and bolt assembly for 2000 hours. The area protected by E2000 / 2400 can still be turned by hand. Proper use of the E2000 / 2400 helps protect flange connections from corrosion.

(9) High temperature flange seal

High-temperature flange components often require plane high-temperature sealing. If there is no good sealant for additional sealing in a separate pressure area, the pressure will cause production inaccuracies or deformation, which means that in a separate pressure area, it will be under pressure. Leaks appear and require unscheduled repairs. The better application in the field of high-temperature flat seals is Bocos high-temperature sealants. Its special formula keeps it inert in standard applications of steam and gas turbines and high-temperature flanges, so it can withstand hot air, steam, water, light fuel. Oils and lubricants, resistant to crude oil and natural gas. It is a one-component, paste-like sealant, industrial use, high-quality sealing mixture, suitable for working conditions requiring high temperature and pressure on smooth and flat sealing surfaces (butt joints). Use a plaster knife or rubber spatula to spread over the dry surface. Since the sealed product will not be cured, but its consistency will change slightly, maintaining flexibility and elasticity, there is no time requirement during use, and it can be put into operation immediately after construction is completed without waiting. If you need to repair the high temperature sealing surface with scratch damage, it should be used in conjunction with Bocos high temperature F series repair products.

Flange (tool part)

Flange (Flange), also known as flange flange or flange. The flange is a part that connects the shaft and the shaft, and is used for the connection between the pipe ends. It is also used in the equipment inlet and outlet for the connection between two devices, such as the reducer flange. The flange connection or flange joint refers to a detachable connection in which a flange, a gasket and a bolt are connected to each other as a group of combined sealing structures. Pipe flange refers to the flange used for piping in pipeline installations, and used on equipment refers to the inlet and outlet flanges of equipment. There are holes in the flange, and the bolts tightly connect the two flanges. The flanges are sealed with gaskets. Flange is divided into threaded connection (thread connection) flange, welding flange and clip flange. The flanges are used in pairs. Wire joint flanges can be used for low pressure pipelines, and welded flanges can be used for pressures above 4 kg. Add a gasket between the two flanges and tighten with bolts. Different pressure flanges have different thicknesses, and they use different bolts. When pumps and valves are connected to pipelines, the parts of these equipment and equipment are also made into corresponding flange shapes, also known as flange connections. Any connection parts that are bolted at the periphery of two planes and closed at the same time are generally referred to as "flange", such as the connection of ventilation ducts, this type of parts can be called "flange parts". However, this connection is only a part of the equipment, such as the connection between the flange and the water pump, it is difficult to call the water pump a "flange-type part". Relatively small ones, such as valves, can be called "flange parts".

Reducer flange, used to connect the motor and the reducer, and the connection between the reducer and other equipment.

Flange connection is to fix two pipes, pipe fittings or equipment respectively on a flange plate first, and add flange pads between the two flange plates, and fasten them with bolts to complete the connection. . Some pipe fittings and equipment already have flanges, which are also flange connections. Flange connection is an important connection method for pipeline construction. The flange connection is easy to use and can withstand large pressures. In industrial piping, in the home, the diameter of the pipe is small and the pressure is low, and the flange connection is not visible. If in a boiler room or production site, flanged pipes and equipment are everywhere. [1]

According to the connection method, the flange connection types can be divided into: plate type flat welding flange, neck flat welding flange, neck welding flange, socket welding flange, thread flange, flange cover, neck welding ring Loose sleeve flange, flat welding ring loose sleeve flange, ring groove surface flange and flange cover, large diameter flat flange, large diameter high neck flange, splayed blind plate, butt welding ring loose sleeve flange, etc.

As for iron plate welding flanges, many customers are asking whether the quality of iron plate welding flanges is better than forged welding flanges. In fact, the quality of iron plate welding flanges is the same as that of forged welding flanges, but where can iron plate welding flanges be guaranteed? That is, the material of iron plate welding flanges is the least guaranteed because In the general process, the density of the iron plate welding flange is no problem, but in the process of production, the blank of the iron plate welding flange is rarely tested. Therefore, after the production, the The material of the welded flange of the iron plate cannot be guaranteed

(1) Reducing flange

Product name: Reducing flange

Technical parameters: implemented in accordance with national standards

Quality Standards: Manufactured in strict accordance with relevant standards formulated by the state

Specifications: DN15-DN2000

Product packaging: wooden box or other

Product Color: Metallic

Product features: anti-corrosion, acid and alkali resistance, long service life, etc., reasonable price calculation, smooth surface, acid and alkali resistance and high temperature resistance, beautiful appearance, strong texture performance

Production process: professional overall forging, forging manufacturing, middle plate cutting, middle plate rolling, etc.

Processing methods: high-precision CNC lathe turning, ordinary lathe precision turning, argon arc welding, etc.

Nominal pressure sch5s, sch10s, sch20s, sch30s, sch40s, etc.

Manufacturing standards: national standard, American standard, Russian standard, Japanese standard, etc.

Material: 201,304.316.316L.0Cr18Ni9.321.202, etc.

Uses: Widely used in water conservancy, electric power, power stations, pipe fittings, industry, pressure vessels, etc.

Connection method: flange nut, bolt connection.

(2) Stainless steel flange

Stainless steel flange

Stainless steel flange

Product Name: Stainless steel flange

Specification: 1/2 ″ ～ 240 ″ (10-6000)

Pressure level: 0.6Mpa to 32Mpa, 150Lb to 2500Lb, PN0.25-PN42.0

Material: 304, 304L, 321, 316, 316L, 310S and other materials

Standards of the Ministry of Chemical Industry: HG5010-52 ～ HG5028-58, HGJ44-91 ～ HGJ65-91, HG20592-2009 (PN series), HG20615-2009 (Calss series)

Application: Boiler and pressure vessel, petroleum, chemical, shipbuilding, pharmaceutical, metallurgy, machinery, food and other industries.

(3) Pressure vessel flange

Product name: Pressure vessel flange

Specification: DN300 ~ 3000

Product Note: Pressure vessel flange application industry: HVAC Power Building Water Supply Pressure vessel accessories, pressure pipeline accessories.

Product category: flange series

Application industries: HVAC, building water supply, pressure vessel fittings, pressure pipe fittings.

Application technical parameters

Sealing nominal pressure PN, MPa (bar) 0.6 1.0 1.6 2.5 4.0 6.4

Concave-convex surface (MFM) DN1300 ~ 3000 DN300 ~ 3000 DN400 ~ 2000 DN300 ~ 800

Tongue and groove surface (TG) DN1300 ~ 3000 DN300 ~ 3000 DN300 ~ 3000 DN300 ~ 800

Full Plane (FF) DN300 ~ 3000 DN300 ~ 3000 DN300 ~ 3000 DN300 ~ 800

(4) Flat welding flange

The flat welding flange includes a plate type flat welding flange and a neck flat welding flange.

Plate flat welding flange (PL)

Schematic diagram of plate type flat welding flange

Schematic diagram of plate type flat welding flange

The flat welding flange is suitable for the connection of steel pipes with a nominal pressure not exceeding 2.5 MPa. The sealing surface of the flat welding flange can be made into three types: smooth, concave-convex and tongue-and-groove. The smooth flat welding flange has the largest application. It is mostly used in the case of relatively mild media conditions, such as low-pressure non-purified compressed air and low-pressure circulating water.

Sketch of neck welded flange

Sketch of neck welded flange

With neck flat welding flange (SO)

The height of the neck of the flat welded flange with neck is low, which increases the rigidity and bearing capacity of the flange. Compared with butt welding flanges, the welding workload is large, the welding rod consumption is high, can not withstand high temperature and pressure and repeated bending and temperature fluctuations, but it is more convenient to install on site, and can omit the process of welding and bruising the weld, which is more popular.

(5) Butt welding with neck (WN)

Butt Welding Flange: Neck flange welding is often referred to as a "high hub" flange. The purpose is to transfer pressure to the pipe, thereby reducing high stress concentrations in the flange base. Neck flange welding is best designed to provide welding to those flanges due to its structural value. However, the price is relatively high, because the production process of the product is complicated.

Threaded (threaded) flange: This threaded flange is connected with a threaded fastener. However, the center of the product has a thread size corresponding to the pipe. Its main advantage is that it can be assembled without welding.

Sliding flanges: Sliding flanges have lower hinges because the pipe goes into the single flange before welding. It is welded internally and externally to provide sufficient strength to prevent leakage. The sliding flanges are all boring for the larger diameter pipes. They are better than the welding of neck flanges. Due to the low initial cost, many users, but the final installation cost will probably not be low, because the added welding neck flange is less.

Lap flange: The lap flange is actually the exact same sliding flange unless it has a radius between the hole and the flange race. It is necessary to have a flange with a flange to accommodate the stub end. Often, lap stubs and lap stubs mate together to assemble the system.

The socket welding flange is a similar sliding flange unless it has a hole and counter hole size. The counter hole matches the pipe so that the pipe is inserted into a sliding flange similar to the flange. The smaller hole diameter is the same ID for the same pipe match. The limitation is the built-in hole, which stays at the bottom as a shoulder cover for the pipe. This eliminates any flow limitation when using socket welding flanges.

(6) Socket welding flange (SW)

Socket welding flange

Socket Welding Flange

Socket welding flange

Socket welding flange

Form of sealing surface: raised surface (RF), concave and convex surface (MFM), tongue and groove surface (TG), ring connection surface (RJ)

Material: Carbon Steel: ASTM A105, 20 #, Q235, 16Mn, ASTM A350 LF1, LF2 CL1 / CL2, LF3 CL1 / CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65 , F70;

Alloy Steel: ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8 / Ⅲ, 35CrMoV, 45CrMo, etc.

Manufacturing standards: ANSI B16.5, GB / T9117.1-2000—GB / T9117.4-200, etc.

(7) Threaded flange (TH)

Nominal diameter of thread flange: DN8 ～ DN100 Working pressure: 1.0 ～ 2.5 （MPa） Material of plate thread flange: stainless steel, carbon steel, alloy steel.

Thread flange use: suitable for fire protection, gas, hot and cold water, air conditioning, air pressure pipes, oil pipes, meters, hydraulic pipes and other industrial and civil pipe thread locking sealing.

Flange cover (BL)

Flange covers, also called blind flanges, are flanges with no holes in the middle for sealing pipe plugs. There are many types of sealing surfaces, including flat surfaces, convex surfaces, concave-convex surfaces, tongue and groove surfaces, and ring connecting surfaces.

Sealing surface: flat surface (FF), raised surface (RF), uneven surface (MFM), tongue and groove surface (TG), ring connection surface (RJ)

Production materials:

Carbon Steel: ASTM A105, 20 #, Q235, 16Mn, ASTM A350 LF1, LF2 CL1 / CL2, LF3 CL1 / CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70 ;

Stainless Steel: ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8;

Alloy Steel: ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8 / Ⅲ.

(8) Loose flange

Loose sleeve flange with neck butt welding ring

Loose sleeve flange butt welding ring loose sleeve with neck flange butt welding ring loose sleeve plate flange flat welding ring loose sleeve plate flange plate type over loose sleeve flange In addition to meet the need for locking after the device, there is a rod These holes can prevent the bolts from loosening when subjected to vibration. Some flange bolts without threads need to be thin, called thin rod flange bolts. Such flange bolts are conducive to the connection of variable forces. Steel There are special high-strength bolts on the structure. The head will be larger. There are also changes in size. Hot-dip galvanized round steel makes the molten metal react with the iron matrix to produce an alloy layer.

Flat welding ring loose sleeve flange (PJ / SE)

The flat welding ring loose flange is a movable flange, which is usually used on water supply and drainage accessories (the most common on expansion joints). When the factory leaves the factory, there is a flange on each end of the expansion joint, which is directly connected with the project The pipes and equipment are connected by bolts. The purpose of using a flat welding ring loose sleeve flange is generally to save material. Its structure is divided into two parts, one end of the pipe part is connected to the pipe, one end is made into a flange, and the flange part is sleeved on the flange. The flange is made of low-grade materials, and the pipe part is made of the same material as the pipe, which saves material.

Flat welding ring loose sleeve flange:

1. Save costs. When the pipe material is special and expensive, welding the flange of the same material is costly.

2. It is not easy to weld or not easy to process or requires high strength. Such as plastic pipes, glass steel pipes and the like.

3. Easy to construct. For example, it is not easy to align the flange bolt holes when connecting or prevent the flange bolt holes of the equipment from being changed in the future.

Disadvantages of flat welding ring loose sleeve flange:

1. Low pressure.

2. Low strength at the welding ring (especially when the thickness is less than 3mm)

Flat welding ring loose flange production standards:

National standard: GB / T9112-2000 (GB9113 · 1-2000 ～ GB9123? 4-2000)

American Standard: ANSI B16.5 Class150, 300, 600, 900, 1500 (WN, SO, BL, TH, LJ, SW)

Japanese standard: JIS 5K, 10K, 16K, 20K (PL, SO, BL, WN, TH, SW)

German standard: DIN2573, 2572, 2631, 2576, 2632, 2633, 2543, 2634, 2545 (PL, SO, WN, BL, TH)

Standards of the Ministry of Chemical Industry: HG5010-52 ～ HG5028-58, HGJ44-91 ～ HGJ65-91

Flange standard: HG20592-2009 (PN series) \ HG20615-2009 (Calss series)

Machinery department standards: JB81-59 ～ JB86-59, JB / T74-1994, JB / T79-94 ～ JB / T86-94

Pressure vessel standards: NB / T47020-2012 ～ NB / T47027-2012, JB1157-82 ～ JB1160-82 B16.47A / B B16.39 B16.48

Ring groove face flange and flange cover

Large diameter flat flange

Large diameter high neck flange

Character blind

Butt welding ring loose flange 6

Swivel flange

Anchor flange

Surfacing / overlaying flange

Marine welding steel flange standard number: This standard applies to marine products and marine engineering products. The main materials are: carbon steel, alloy steel, low temperature steel, stainless steel.

Forged flange connection is to connect two pipes, fittings or equipment, and forged flange connection is an important connection method for pipeline construction. The forged flange connection is easy to use and can withstand large pressures. In industrial pipelines, forged flange connections are widely used. In the home, the pipe diameter is small and the pressure is low, and the connection of the flange punching elbow is not visible. If in a boiler room or production site, flanged pipes and equipment are everywhere. Chromium content 0.1% ～ 0.5% (forged flanges generally do not contain chromium), carbon content is below 1.0% and forged flanges are manufactured by high temperature forging. Some forged flanges have surface hardness (HRC) although It can reach ≥56 (the hardened layer is only about 15）). Due to the poor hardenability of the forged flange material, its core hardness is generally only more than 30 degrees. Under normal circumstances, the water forged flange is often used.

Structure of flange sealing cover:

316 stainless steel band or non-metallic band

316 ss casting

316 ss worm gear fixture

Closed tank neoprene layer (temperature. – 34.4 ° C to 82 ° C)

ECH rubber gasket (temperature. – 34.4 ° C to 149 ° C) safety relief valve can release 5 psi

Advantages of Mestech flange seals: easy installation, no special tools required, easy detection, durable connections (not easy to damage), UV-stable non-metallic materials, reusable

Flange packing system

Suitable for temperatures of 80 ° C.

Flange packing is a unique solution to long-term corrosion problems.

Flange packing is a coating based on a composite polar polymer. The paste-like form makes it ready for use without pretreatment. The viscoelastic formulation allows this material to flow into the gaps and voids, creating a good corrosion-resistant seal.

Flange Packing System Flange packing saves time and money because of its ease of use. Provide long-term protection.

Performance: Bonded to steel, FBE (melted epoxy powder), polyurethane, polyethylene Advanced resistance weathering / salt resistance temperature range from -51 ° C to 80 ° C Fill the entire gap Removable / reusable flange surface without excessive Pretreatment uses a manual or pneumatic gun with a flexible nozzle for gentle injection. This ensures that the annular gap is completely filled before being sealed with a CZ wrapping tape.

E-2400 / E2000 high temperature flange packing-suitable for temperature of 149 ° C.

E-2400 / E2000 high temperature anti-corrosion flange packing is designed to protect the flange connection from corrosion in the high temperature of 149 ° C.

E-2400 / E2000 is a non-electrolytic method to protect steel flanges, bolts, pipes and structures with a gel.

The ASTM-B1117 salt spray test was used to test the nut and bolt assembly for 2000 hours. The area protected by E2000 / 2400 can still be turned by hand. Proper use of the E2000 / 2400 helps protect flange connections from corrosion.

(9) High temperature flange seal

High-temperature flange components often require plane high-temperature sealing. If there is no good sealant for additional sealing in a separate pressure area, the pressure will cause production inaccuracies or deformation, which means that in a separate pressure area, it will be under pressure. Leaks appear and require unscheduled repairs. The better application in the field of high-temperature flat seals is Bocos high-temperature sealants. Its special formula keeps it inert in standard applications of steam and gas turbines and high-temperature flanges, so it can withstand hot air, steam, water, light fuel. Oils and lubricants, resistant to crude oil and natural gas. It is a one-component, paste-like sealant, industrial use, high-quality sealing mixture, suitable for working conditions requiring high temperature and pressure on smooth and flat sealing surfaces (butt joints). Use a plaster knife or rubber spatula to spread over the dry surface. Since the sealed product will not be cured, but its consistency will change slightly, maintaining flexibility and elasticity, there is no time requirement during use, and it can be put into operation immediately after construction is completed without waiting. If you need to repair the high temperature sealing surface with scratch damage, it should be used in conjunction with Bocos high temperature F series repair products.